CA2987123A1 - Device for dewatering feedstock that is pourable or free-flowing - Google Patents
Device for dewatering feedstock that is pourable or free-flowing Download PDFInfo
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- CA2987123A1 CA2987123A1 CA2987123A CA2987123A CA2987123A1 CA 2987123 A1 CA2987123 A1 CA 2987123A1 CA 2987123 A CA2987123 A CA 2987123A CA 2987123 A CA2987123 A CA 2987123A CA 2987123 A1 CA2987123 A1 CA 2987123A1
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- Prior art keywords
- segments
- holes
- pipe
- segment
- shell pipe
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
- B30B9/124—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing using a rotatable and axially movable screw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/26—Permeable casings or strainers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C7/00—Digesters
- D21C7/06—Feeding devices
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
- F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/14—Drying solid materials or objects by processes not involving the application of heat by applying pressure, e.g. wringing; by brushing; by wiping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/086—Presses with means for extracting or introducing gases or liquids in the mat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/24—Wood particles, e.g. shavings, cuttings, saw dust
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
- Filtration Of Liquid (AREA)
- Screw Conveyors (AREA)
- Joints Allowing Movement (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a device, and a segment of an internal pipe for the device, for dewatering feedstock that is pourable or free-flowing by compression. The device and segment can be used for low-cost refurbishment of worn parts in dewatering devices. The device comprises a housing with a shell pipe in which a shaft with flights running around its circumference rotates around an axis of rotation, where the feedstock is transported through the housing and compressed and the pressate is conveyed out of the device through holes in the shell pipe, and where an internal pipe is provided. The internal pipe is built up from segments with holes, where the outer surface of the segments rests directly on the inner surface of the shell pipe and the holes in the segments overlay the holes in the shell pipe, where the segments are made of wear-resistant cast or sintered material.
Description
DEVICE FOR DEWATERING FEEDSTOCK THAT IS POURABLE OR FREE-FLOWING
The invention relates to a device for dewatering feedstock that is pourable or free-flowing, for example wood chips, by compressing it, comprising a housing with a shell pipe in which a shaft with flights running round its circumference rotates round an axis of rotation, where the feedstock is transported through the housing and compressed and the pressate is conveyed out of the device through holes in the shell pipe, and where an internal pipe is provided.
Devices of this kind are known, for example from DE 20 2007 007 038 Ul, where these devices usually have a feed unit, in the form of a chute for example. Special designs serve to feed wood chips into a pulp digester in the chemical pulp industry and are often also referred to as plug screw feeders in this context. There are also applications as feed units to digesters in the mechanical pulp industry. In general, a material is conveyed from an area under low pressure to an area under higher pressure or vice versa. These devices are thus also used as an air lock. In addition to squeezing out the pressate (effluent), which is usually water possibly containing chemicals if required, compression of the material serves in addition to create a densely compacted plug of the material that seals off the inlet towards the pressurized system of a digester. A highly compacted material plug that absorbs impregnating chemicals, in this case when the pressure is relieved, is also produced in other devices, such as MSDs. In devices of this kind, there is a lot of wear both on the screw fighting and on the shell pipe due to high compacting of the feedstock, resulting in high pressing forces on the inside of the screw shell, so that devices of this kind have to be refurbished or reinforced at regular intervals. This involves considerable costs and longer shutdowns in production. The worn housings are often refurbished by applying hard-facing and then machining them. The disadvantage of this hard-facing method is that the workpiece becomes warped and also shrinks during welding and can no longer be positioned precisely inside the shell pipe as a result. The residual stress as a consequence of applying heat during welding can lead to cracks forming and, as a further consequence, to component failure. Refurbishment is expensive and time-consuming, and the component has to be brought to a workshop for refurbishing. As an alternative, so-called wear shells can be inserted, which can then be replaced. These are cylinder half sections made of wear-resistant material, which are fitted into the shell pipe after it is dismantled and thus form an internal pipe. These are very difficult to manufacture, and there are frequent problems with the fit. Wear shells of this kind are usually also more expensive than refurbishment by hard-facing.
The aim of the invention is to disclose a device that is significantly cheaper and avoids the disadvantages mentioned above.
The invention is thus characterized in that the internal pipe is built up from segments with holes, where the outer surface of the segments rests directly on the inner surface of the shell pipe and the holes in the segments overlay the holes in the shell pipe, where the holes in the segments have a smaller cross-section than the holes in the shell pipe, and each hole in the segments is assigned to a hole in the shell pipe and where the segments are made of wear-resistant cast or sintered material.
Due to the structure of the internal pipe made of segments, the parts to be replaced are smaller and can be transported more easily. As the segments rest directly on the inner surface of the shell pipe, these parts are supported over their entire area and can thus be manufactured with very low wall thicknesses. In addition, the shell pipe and the segments can be made of different materials, allowing the shell pipe to absorb the forces and the segments to be made of a hard, brittle, and thus wear-resistant material. As they are designed as cast or sintered parts, the segments can be left unmachined for the most part. Thus, there is no need for costly machining of large areas on the outer or the inner surface. In addition, the holes can be cast in the part itself so there is no need for subsequent, labour-intensive drilling, particularly metal-cutting drilling. As a result, it is also possible to use harder materials that cannot be machined.
Optimum dewatering is achieved because the holes in the segments match up with the holes in the shell pipe.
A favourable embodiment of the invention is characterized in that the shell pipe is cylindrical, but can be conical as an alternative. In this way, the device can be adapted easily to the production needs and to the screw required for this purpose.
A favourable development of the invention is characterized in that the internal pipe comprises at least 4, preferably 6-8 segments in circumferential direction. As a result, areas that are less worn can be left in place and only areas with more wear need to be replaced.
An advantageous embodiment of the invention is characterized in that the internal pipe comprises at least 2, preferably 3-4 and up to 6 segments in longitudinal direction in accordance with the direction of the axis of rotation. This makes installation much easier on
The invention relates to a device for dewatering feedstock that is pourable or free-flowing, for example wood chips, by compressing it, comprising a housing with a shell pipe in which a shaft with flights running round its circumference rotates round an axis of rotation, where the feedstock is transported through the housing and compressed and the pressate is conveyed out of the device through holes in the shell pipe, and where an internal pipe is provided.
Devices of this kind are known, for example from DE 20 2007 007 038 Ul, where these devices usually have a feed unit, in the form of a chute for example. Special designs serve to feed wood chips into a pulp digester in the chemical pulp industry and are often also referred to as plug screw feeders in this context. There are also applications as feed units to digesters in the mechanical pulp industry. In general, a material is conveyed from an area under low pressure to an area under higher pressure or vice versa. These devices are thus also used as an air lock. In addition to squeezing out the pressate (effluent), which is usually water possibly containing chemicals if required, compression of the material serves in addition to create a densely compacted plug of the material that seals off the inlet towards the pressurized system of a digester. A highly compacted material plug that absorbs impregnating chemicals, in this case when the pressure is relieved, is also produced in other devices, such as MSDs. In devices of this kind, there is a lot of wear both on the screw fighting and on the shell pipe due to high compacting of the feedstock, resulting in high pressing forces on the inside of the screw shell, so that devices of this kind have to be refurbished or reinforced at regular intervals. This involves considerable costs and longer shutdowns in production. The worn housings are often refurbished by applying hard-facing and then machining them. The disadvantage of this hard-facing method is that the workpiece becomes warped and also shrinks during welding and can no longer be positioned precisely inside the shell pipe as a result. The residual stress as a consequence of applying heat during welding can lead to cracks forming and, as a further consequence, to component failure. Refurbishment is expensive and time-consuming, and the component has to be brought to a workshop for refurbishing. As an alternative, so-called wear shells can be inserted, which can then be replaced. These are cylinder half sections made of wear-resistant material, which are fitted into the shell pipe after it is dismantled and thus form an internal pipe. These are very difficult to manufacture, and there are frequent problems with the fit. Wear shells of this kind are usually also more expensive than refurbishment by hard-facing.
The aim of the invention is to disclose a device that is significantly cheaper and avoids the disadvantages mentioned above.
The invention is thus characterized in that the internal pipe is built up from segments with holes, where the outer surface of the segments rests directly on the inner surface of the shell pipe and the holes in the segments overlay the holes in the shell pipe, where the holes in the segments have a smaller cross-section than the holes in the shell pipe, and each hole in the segments is assigned to a hole in the shell pipe and where the segments are made of wear-resistant cast or sintered material.
Due to the structure of the internal pipe made of segments, the parts to be replaced are smaller and can be transported more easily. As the segments rest directly on the inner surface of the shell pipe, these parts are supported over their entire area and can thus be manufactured with very low wall thicknesses. In addition, the shell pipe and the segments can be made of different materials, allowing the shell pipe to absorb the forces and the segments to be made of a hard, brittle, and thus wear-resistant material. As they are designed as cast or sintered parts, the segments can be left unmachined for the most part. Thus, there is no need for costly machining of large areas on the outer or the inner surface. In addition, the holes can be cast in the part itself so there is no need for subsequent, labour-intensive drilling, particularly metal-cutting drilling. As a result, it is also possible to use harder materials that cannot be machined.
Optimum dewatering is achieved because the holes in the segments match up with the holes in the shell pipe.
A favourable embodiment of the invention is characterized in that the shell pipe is cylindrical, but can be conical as an alternative. In this way, the device can be adapted easily to the production needs and to the screw required for this purpose.
A favourable development of the invention is characterized in that the internal pipe comprises at least 4, preferably 6-8 segments in circumferential direction. As a result, areas that are less worn can be left in place and only areas with more wear need to be replaced.
An advantageous embodiment of the invention is characterized in that the internal pipe comprises at least 2, preferably 3-4 and up to 6 segments in longitudinal direction in accordance with the direction of the axis of rotation. This makes installation much easier on
2 the one hand, and on the other hand, the areas with less wear can be left as they are and only areas with more wear, particularly at the end where there is considerable compaction, need to be replaced.
A favourable development of the invention is characterized by the holes in the segments becoming wider conically towards the outer surface. As a result, any plugging of the holes can largely be avoided.
Another favourable embodiment of the invention is characterized in that the segments each have a groove in longitudinal direction. These grooves can be used in particular to prevent the feed material from rotating together with the shaft and fighting.
An alternative embodiment of the invention is characterized in that the segments each have, in particular, an integrated strip in longitudinal direction. These strips can also be used to prevent the feed material from rotating together with the shaft and fighting.
The invention also relates to a segment of an internal pipe for a device to dewater feedstock that is pourable or free-flowing, for example wood chips, with a housing with a shell pipe with holes and in which the internal pipe is provided. It is characterized in that the segment is made of wear-resistant cast or sintered material, where holes are provided with a smaller cross-section than the holes in the shell pipe, where the holes become wider conically towards the outer surface. In particular, the design with cast or sintered material enables low-cost manufacture and dispenses with the need for further machining. As a result, the dewatering holes can be cast together with the part so there is no need for labour-intensive drilling.
The invention will now be described in examples and referring to the drawings, where Fig. 1 shows the basic structure of a generic dewatering device, Fig. 2 shows the housing of a device according to the invention with internal pipe, Fig. 3 shows a half shell from the device according to the invention, Fig. 4 shows a half shell and illustrates the segments according to the invention and the way in which they are secured, Fig. 5 shows a variant of a segment according to the invention,
A favourable development of the invention is characterized by the holes in the segments becoming wider conically towards the outer surface. As a result, any plugging of the holes can largely be avoided.
Another favourable embodiment of the invention is characterized in that the segments each have a groove in longitudinal direction. These grooves can be used in particular to prevent the feed material from rotating together with the shaft and fighting.
An alternative embodiment of the invention is characterized in that the segments each have, in particular, an integrated strip in longitudinal direction. These strips can also be used to prevent the feed material from rotating together with the shaft and fighting.
The invention also relates to a segment of an internal pipe for a device to dewater feedstock that is pourable or free-flowing, for example wood chips, with a housing with a shell pipe with holes and in which the internal pipe is provided. It is characterized in that the segment is made of wear-resistant cast or sintered material, where holes are provided with a smaller cross-section than the holes in the shell pipe, where the holes become wider conically towards the outer surface. In particular, the design with cast or sintered material enables low-cost manufacture and dispenses with the need for further machining. As a result, the dewatering holes can be cast together with the part so there is no need for labour-intensive drilling.
The invention will now be described in examples and referring to the drawings, where Fig. 1 shows the basic structure of a generic dewatering device, Fig. 2 shows the housing of a device according to the invention with internal pipe, Fig. 3 shows a half shell from the device according to the invention, Fig. 4 shows a half shell and illustrates the segments according to the invention and the way in which they are secured, Fig. 5 shows a variant of a segment according to the invention,
3 Fig. 6 shows another variant of a segment according to the invention.
Fig. 7 shows an additional variant of a segment according to the invention.
Figure 1 shows a dewatering device 1 with a plug screw feeder 2 and drive 3.
The drive 3 has a drive motor 4, a gearbox 5, a coupling 6, for example a high-speed coupling, another coupling 7, for example a low-speed coupling, and safety devices 8. The plug screw feeder 2 comprises a feed chute 9, the housing 10 with a discharge chamber 11, as well as the screw 12 with flights 13. The housing 10 can be cylindrical as shown, but may also be tapered conically. The housing 10 of the plug screw feeder 2 is mounted on a vessel 14, which can be a pulp digester if the device is used in the chemical pulp industry, where the vessel generally has a different pressure stage, but the materials can also have a different physical state. The plug screw feeder then acts here as an air lock. The material placed in the feed chute, e.g.
wood chips, but also annual plants, straw, bagasse, or similar, is carried by the flights 13 of the screw 12 into the housing 10 and pressed through it, during which process liquid, mainly water that may be mixed with chemicals, flows into the discharge chamber 11 and is discharged from there and fed to a recycling unit if necessary. A highly compacted material plug that absorbs impregnating chemicals, in this case when the pressure is relieved, is also produced in other devices, such as MSDs. Due to the high degree of compression of the feed material, extensive wear occurs on the inside of the housing 10 so these housings must be refurbished or reinforced frequently. One possibility is to dismantle the housing and have it brought to a workshop for hard-facing and then machining so that it is ready for operation again. As a result, the plant operator cannot use this component for a longer period, not even as a spare part for emergencies. Replaceable wear shells can be used as an alternative.
However, they must be manufactured with high precision, and there are often problems with the fit.
Figure 2 shows a housing 10 according to the invention, which consists of a top half shell 15 and a bottom half shell 16. These shells have dewatering holes 17, which can be arranged in groups as shown. The half shells 15, 16 each have flanges 18 and 18', respectively, at the ends with which the housing is mounted on the feed chute 9 at one side and the vessel 14 at the other side. The two half shells 15, 16 are held together with a number of screws 19.
Segments 21, 22 are arranged inside the half shells 15, 16. More screws 20 are used to secure these segments 21, 22 to the housing 10. All of the segments 21, 22 together form an internal
Fig. 7 shows an additional variant of a segment according to the invention.
Figure 1 shows a dewatering device 1 with a plug screw feeder 2 and drive 3.
The drive 3 has a drive motor 4, a gearbox 5, a coupling 6, for example a high-speed coupling, another coupling 7, for example a low-speed coupling, and safety devices 8. The plug screw feeder 2 comprises a feed chute 9, the housing 10 with a discharge chamber 11, as well as the screw 12 with flights 13. The housing 10 can be cylindrical as shown, but may also be tapered conically. The housing 10 of the plug screw feeder 2 is mounted on a vessel 14, which can be a pulp digester if the device is used in the chemical pulp industry, where the vessel generally has a different pressure stage, but the materials can also have a different physical state. The plug screw feeder then acts here as an air lock. The material placed in the feed chute, e.g.
wood chips, but also annual plants, straw, bagasse, or similar, is carried by the flights 13 of the screw 12 into the housing 10 and pressed through it, during which process liquid, mainly water that may be mixed with chemicals, flows into the discharge chamber 11 and is discharged from there and fed to a recycling unit if necessary. A highly compacted material plug that absorbs impregnating chemicals, in this case when the pressure is relieved, is also produced in other devices, such as MSDs. Due to the high degree of compression of the feed material, extensive wear occurs on the inside of the housing 10 so these housings must be refurbished or reinforced frequently. One possibility is to dismantle the housing and have it brought to a workshop for hard-facing and then machining so that it is ready for operation again. As a result, the plant operator cannot use this component for a longer period, not even as a spare part for emergencies. Replaceable wear shells can be used as an alternative.
However, they must be manufactured with high precision, and there are often problems with the fit.
Figure 2 shows a housing 10 according to the invention, which consists of a top half shell 15 and a bottom half shell 16. These shells have dewatering holes 17, which can be arranged in groups as shown. The half shells 15, 16 each have flanges 18 and 18', respectively, at the ends with which the housing is mounted on the feed chute 9 at one side and the vessel 14 at the other side. The two half shells 15, 16 are held together with a number of screws 19.
Segments 21, 22 are arranged inside the half shells 15, 16. More screws 20 are used to secure these segments 21, 22 to the housing 10. All of the segments 21, 22 together form an internal
4 pipe inside the housing 10. Here there are 6 segments 21, 22 shown distributed round the circumference. However, there may also be fewer or more segments distributed round the circumference, depending on the diameter of the housing 10. Here, the outer surface of the segments 21, 22 rests directly, i.e. without any gap, on the inner surface of the half shells 15, 16 of the housing 10.
Figure 3 shows the bottom half shell 16. It has flanges 18, 18' at the ends.
The individual segments 21, 22 have holes 23 so that they can be secured with screws 20. It is visible from the figure that different segments can be used here. The segments 21 have a groove 24 running along their length, which serves to prevent materials from rotating together with the shaft and fighting. In addition to segments 21, there are also segments 22 that do not have a groove. The number of segments 21 with a groove 24 and segments 22 is selected on the basis of the dewatering behaviour, but also in view of the caking and thus the entrainment properties of the feed material. The use of segments 21 and 22, respectively, thus provides a means of adjusting dewatering and entrainment of the feed material. As an alternative to segments with a groove, it is also possible to insert segments 22' (see Fig.
7) with strips in order to prevent entrainment of the feed material. Three segments 21 and 22, respectively, in a row are shown in longitudinal direction of the housing 10. Depending on the length of the housing 10, it would of course be possible to arrange several segments 21, 22 in longitudinal direction, i.e. in axial direction of the screw. It is important that the holes 25 in the segments 21, 22 match up directly with the holes 17 in the half shells 15, 16, i.e. each hole 25 in a segment 21, 22 is assigned to a hole 17 in a half shell 15, 16 of the housing 10. This is achieved by securing with screws 20, among other things. The screws 20 are inserted from the inside, i.e. from inside the cylinder formed by the segments 21, 22, and secured on the outside with nuts. Thus, there is no need for any threads in the segments 21, 22, nor in the half shell 15, 16 of the housing 10. As a result, much harder materials can be used for the segments 21, 22 because no machining is necessary. The screws 20 can have a spherical cap in longitudinal direction, for example, so that they are always in the correct position in the correspondingly shaped holes 23. The screws 20 can also have indentations such as slots, for example, at the inner (cylinder) surface of the segments 21, 22, which then form a flat surface due to wear on the segments and on the raised part of the screw heads and, as such, can be used as wear indicators that show when the segments 21, 22 need to be replaced. Segments 21 and 22 are cast from wear-resistant material, thus all holes 25 can be formed easily without requiring any subsequent machining. The holes 25 here can also be formed in a conical shape very easily and need not be step-drilled, which would require frequent tool changes during manufacture. Alternatively, the segments can also be sintered from wear-resistant material, which also offers the opportunity to form the holes 25 easily right away in one process. The design of the segments 21, 22 as cast or sintered parts means that substantially harder materials can be used that no longer require machining with normal cutting tools, such as drills.
In order to be able to save on further machining, only the contact surfaces 26 on the longitudinal sides of the segment 21, 22 edges close to the ends of the segments 21, 22 have to be machined lightly in order to guarantee that the individual segments 21, 22 are positioned exactly. As several segments 21, 22 are arranged in longitudinal direction, it is also possible only to replace the segments with the most wear. With this type of inner lining in the housing, repairs can be made quickly and easily on site.
Figure 4 shows the simple installation using a segment 21 as an example. The figure shows three segments 21 with grooves 24 around the circumference of a bottom half shell 16, resulting in 6 segments over the entire circumference of the housing 10. The holes 25 that overlay the corresponding holes 17 in the half shell 16 are shown in the last segment 21. In addition, the fastening screws 20 and the machined contact surfaces 26 are visible. The segments 21 (and also 22) are not machined on the face ends. The outer surfaces and inner surfaces are not machined either because the grooves 24 can also be cast along with the part.
Figures 5, 6, and 7 show segments 21, 22, and 22' according to the invention.
They show holes 23 for the fastening screws 20, dewatering holes 25, and contact surfaces 26. The difference between segments 21 and 22 is that segment 21 has a groove 24 in addition that prevents the material from rotating with the shaft and fighting. Figure 7 contains a variant of a segment 22' in which a strip 27 is provided instead of a groove 24. This strip is also intended to prevent the material from rotating with the shaft and fighting.
With a cast or sintered part, this strip can be integrated well and manufactured in one piece. This avoids the disadvantages of strips being screwed on. In addition, there is no need to rework the segment afterwards, e.g. in metal-cutting processes (grinding a groove, drilling holes for screws) so harder materials can be used.
The invention is not limited to examples in the drawings, which show a slightly conical housing. The housing can also be cylindrical, for example, and have cylindrical segments inserted into it. In addition, the housing could comprise three or four parts if the diameters are larger.
Figure 3 shows the bottom half shell 16. It has flanges 18, 18' at the ends.
The individual segments 21, 22 have holes 23 so that they can be secured with screws 20. It is visible from the figure that different segments can be used here. The segments 21 have a groove 24 running along their length, which serves to prevent materials from rotating together with the shaft and fighting. In addition to segments 21, there are also segments 22 that do not have a groove. The number of segments 21 with a groove 24 and segments 22 is selected on the basis of the dewatering behaviour, but also in view of the caking and thus the entrainment properties of the feed material. The use of segments 21 and 22, respectively, thus provides a means of adjusting dewatering and entrainment of the feed material. As an alternative to segments with a groove, it is also possible to insert segments 22' (see Fig.
7) with strips in order to prevent entrainment of the feed material. Three segments 21 and 22, respectively, in a row are shown in longitudinal direction of the housing 10. Depending on the length of the housing 10, it would of course be possible to arrange several segments 21, 22 in longitudinal direction, i.e. in axial direction of the screw. It is important that the holes 25 in the segments 21, 22 match up directly with the holes 17 in the half shells 15, 16, i.e. each hole 25 in a segment 21, 22 is assigned to a hole 17 in a half shell 15, 16 of the housing 10. This is achieved by securing with screws 20, among other things. The screws 20 are inserted from the inside, i.e. from inside the cylinder formed by the segments 21, 22, and secured on the outside with nuts. Thus, there is no need for any threads in the segments 21, 22, nor in the half shell 15, 16 of the housing 10. As a result, much harder materials can be used for the segments 21, 22 because no machining is necessary. The screws 20 can have a spherical cap in longitudinal direction, for example, so that they are always in the correct position in the correspondingly shaped holes 23. The screws 20 can also have indentations such as slots, for example, at the inner (cylinder) surface of the segments 21, 22, which then form a flat surface due to wear on the segments and on the raised part of the screw heads and, as such, can be used as wear indicators that show when the segments 21, 22 need to be replaced. Segments 21 and 22 are cast from wear-resistant material, thus all holes 25 can be formed easily without requiring any subsequent machining. The holes 25 here can also be formed in a conical shape very easily and need not be step-drilled, which would require frequent tool changes during manufacture. Alternatively, the segments can also be sintered from wear-resistant material, which also offers the opportunity to form the holes 25 easily right away in one process. The design of the segments 21, 22 as cast or sintered parts means that substantially harder materials can be used that no longer require machining with normal cutting tools, such as drills.
In order to be able to save on further machining, only the contact surfaces 26 on the longitudinal sides of the segment 21, 22 edges close to the ends of the segments 21, 22 have to be machined lightly in order to guarantee that the individual segments 21, 22 are positioned exactly. As several segments 21, 22 are arranged in longitudinal direction, it is also possible only to replace the segments with the most wear. With this type of inner lining in the housing, repairs can be made quickly and easily on site.
Figure 4 shows the simple installation using a segment 21 as an example. The figure shows three segments 21 with grooves 24 around the circumference of a bottom half shell 16, resulting in 6 segments over the entire circumference of the housing 10. The holes 25 that overlay the corresponding holes 17 in the half shell 16 are shown in the last segment 21. In addition, the fastening screws 20 and the machined contact surfaces 26 are visible. The segments 21 (and also 22) are not machined on the face ends. The outer surfaces and inner surfaces are not machined either because the grooves 24 can also be cast along with the part.
Figures 5, 6, and 7 show segments 21, 22, and 22' according to the invention.
They show holes 23 for the fastening screws 20, dewatering holes 25, and contact surfaces 26. The difference between segments 21 and 22 is that segment 21 has a groove 24 in addition that prevents the material from rotating with the shaft and fighting. Figure 7 contains a variant of a segment 22' in which a strip 27 is provided instead of a groove 24. This strip is also intended to prevent the material from rotating with the shaft and fighting.
With a cast or sintered part, this strip can be integrated well and manufactured in one piece. This avoids the disadvantages of strips being screwed on. In addition, there is no need to rework the segment afterwards, e.g. in metal-cutting processes (grinding a groove, drilling holes for screws) so harder materials can be used.
The invention is not limited to examples in the drawings, which show a slightly conical housing. The housing can also be cylindrical, for example, and have cylindrical segments inserted into it. In addition, the housing could comprise three or four parts if the diameters are larger.
Claims (12)
1. Device for dewatering feedstock that is pourable or free-flowing, for example wood chips, by compressing it, comprising a housing (10) with a shell pipe (15, 16) in which a shaft with flights (13) running round its circumference rotates round an axis of rotation, where the feedstock is transported through the housing (10) and compressed and the pressate is conveyed out of the device through holes (17) in the shell pipe (15, 16), and where an internal pipe is provided, characterized in that the internal pipe is built up from segments (21, 22) with holes (25), where the outer surface of the segments (21, 22) rests directly on the inner surface of the shell pipe (15, 16) and the holes (25) in the segments overlay the holes (17) in the shell pipe (15, 16), where the holes (25) in the segments (21, 22) have a smaller cross-section than the holes (17) in the shell pipe (15, 16), and each hole (25) in the segments (21, 22) is assigned to a hole (17) in the shell pipe (15, 16) and where the segments (21, 22) are made of wear-resistant cast or sintered material.
2. Device according to Claim 1, characterized in that the shell pipe (15, 16) is cylindrical.
3. Device according to Claim 1, characterized in that the shell pipe (15, 16) is conical.
4. Device according to one of Claims 1 to 3, characterized in that the internal pipe comprises at least 4, preferably 6-8 segments (21, 22) in circumferential direction.
5. Device according to one of Claims 1 to 4, characterized in that the internal pipe comprises at least 2, preferably 3-4 and up to 6 segments (21, 22) in longitudinal direction in accordance with the direction of the axis of rotation.
6. Device according to Claims 1 to 5, characterized by the holes (25) in the segments (21, 22) becoming wider conically towards the outer surface.
7. Device according to one of Claims 1 to 6, characterized in that the segments (21, 22) each have a groove (24) in longitudinal direction.
8. Device according to one of Claims 1 to 6, characterized in that the segments (21, 22) each have a strip (27) in longitudinal direction, in particular an integrated strip.
9. Segment of an internal pipe for a device for dewatering feedstock that is pourable or free-flowing, for example wood chips, with a housing (10) with a shell pipe (15, 17) with holes (17) in which the internal pipe is located, characterized in that the segment (21, 22) is made of wear-resistant cast or sintered material, where it has holes (25) with a smaller cross-section than the holes in the shell pipe (15, 16).
10. Segment according to Claim 9, characterized by the holes (25) becoming wider conically towards the outer surface.
11. Segment according to Claim 9 or 10, characterized in that the segment (21, 22) has a groove (24) in longitudinal direction.
12. Segment according to Claim 9 or 10, characterized in that the segment (21, 22) has a strip (27) in longitudinal direction, in particular an integrated strip.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA51097/2016A AT518983B1 (en) | 2016-12-02 | 2016-12-02 | DEVICE FOR WASHING DEEP-WATERED OR FLUIDABLE SUPPLY MATERIAL |
| ATA51097/2016 | 2016-12-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2987123A1 true CA2987123A1 (en) | 2018-06-02 |
| CA2987123C CA2987123C (en) | 2023-08-08 |
Family
ID=60201947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2987123A Active CA2987123C (en) | 2016-12-02 | 2017-11-30 | Device for dewatering feedstock that is pourable or free-flowing |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US10870250B2 (en) |
| EP (1) | EP3330068B1 (en) |
| CN (1) | CN108204715B (en) |
| AT (1) | AT518983B1 (en) |
| CA (1) | CA2987123C (en) |
| EA (1) | EA036223B1 (en) |
| MY (1) | MY190385A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT523264B1 (en) * | 2020-03-16 | 2021-07-15 | Andritz Ag Maschf | Process for the production of a sieve body and sieve |
| EP3896217B1 (en) * | 2020-04-17 | 2023-06-07 | Cellwood Machinery AB | Apparatus and method for processing a suspension comprising organic material and liquid |
| CN112611170A (en) * | 2020-12-16 | 2021-04-06 | 苏州嘉诺环境工程有限公司 | Dewatering equipment |
| CN113442502A (en) * | 2021-08-10 | 2021-09-28 | 哈尔滨重齿传动设备有限公司 | Vertical briquetting machine |
| CN113983764A (en) * | 2021-11-22 | 2022-01-28 | 上海牧融机械设备有限公司 | Spiral secondary extrusion dehydrator |
| DK181177B1 (en) * | 2021-11-29 | 2023-03-27 | Haarslev Ind A/S | Cage opening assistant |
| CN114198988B (en) * | 2021-12-29 | 2022-10-25 | 双胞胎（集团）股份有限公司 | A dewatering system for domestic animal feed ingredient |
| CN118207743A (en) * | 2022-06-21 | 2024-06-18 | 汶瑞机械(山东)有限公司 | Line pressure regulating mechanism for roller of double-roller pulp washer |
| CN116080128B (en) * | 2023-04-10 | 2023-06-23 | 蓬莱京鲁渔业有限公司 | Fish meal processing grinder for fodder |
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|---|---|---|---|---|
| DE46208C (en) * | 1888-06-15 | 1889-02-21 | M. EHRHARDT in Wolfenbüttel | NEW IN DOUBLE-WALLED CYLINDRICAL PREF-PLUGS FOR OIL SEEDS |
| US2320765A (en) * | 1941-09-17 | 1943-06-01 | French Oil Mill Machinery | Expressing press |
| DE830895C (en) * | 1949-05-26 | 1952-02-07 | Albert William Sizer | Device for extracting liquid from plastic materials, in which the material is pressed through a jacket with perforated walls by means of a conveyor screw or the like |
| US2800072A (en) * | 1954-04-28 | 1957-07-23 | American Viscose Corp | Cylindrical press assembly |
| US2910183A (en) * | 1955-05-31 | 1959-10-27 | Fmc Corp | Strainer |
| US3093065A (en) * | 1957-11-25 | 1963-06-11 | French Oil Mill Machinery | Expressing press |
| US3191521A (en) * | 1959-08-24 | 1965-06-29 | Coproducts Corp | Fluid expressing method |
| US3982483A (en) * | 1975-04-25 | 1976-09-28 | Corral Industries, Inc. | Moisture reduction press |
| GB1573061A (en) * | 1976-01-09 | 1980-08-13 | Somat Corp | Modular split screen hydro extractor |
| SE416481B (en) * | 1977-05-02 | 1981-01-05 | Mo Och Domsjoe Ab | METHOD AND DEVICE FOR TREATMENT OF WOOD TIP FOR REMOVAL OF HEAVY METALS AND RESIN |
| US4155299A (en) * | 1978-02-06 | 1979-05-22 | Somat Corporation | Screen for hydro-extractor |
| US4297943A (en) * | 1979-12-10 | 1981-11-03 | Laurich Trost Victor | Cage assembly for press assembly |
| WO1992013710A1 (en) * | 1991-02-12 | 1992-08-20 | Andritz Sprout-Bauer, Inc. | Adjustable compression screw device and components |
| AT398090B (en) * | 1992-05-15 | 1994-09-26 | Andritz Patentverwaltung | DEVICE FOR SEPARATING LIQUID FROM SOLIDS-LIQUID MIXTURES WITH A SOLIDS RETENTION DEVICE AND DEVICE IN THE FORM OF A SCREW PRESS |
| EP0685325B1 (en) * | 1994-05-04 | 1999-09-01 | SCHLEGEL, Dietrich, Dr. Ing. | Device for separating the liquid portion from the solid portion in two-phase systems |
| CN2305280Y (en) * | 1997-06-25 | 1999-01-27 | 林清和 | Extruding filter in liquid |
| AU762906B2 (en) * | 1999-11-09 | 2003-07-10 | Ishigaki Company Limited | Screw press |
| ITTO20040109A1 (en) * | 2004-02-26 | 2004-05-26 | Vm Press Srl | WASTE COMPACTING MACHINE |
| CN2719555Y (en) * | 2004-03-19 | 2005-08-24 | 白克微 | Multi stage combined spiral oil press |
| DE202007007038U1 (en) * | 2007-05-14 | 2007-10-25 | Pallmann Maschinenfabrik Gmbh & Co Kg | Device for dewatering pourable or pourable feed material by compaction |
| KR20110027135A (en) * | 2009-09-09 | 2011-03-16 | 김종철 | Lattice aseembly body for oil press |
| US20130199383A1 (en) * | 2012-02-06 | 2013-08-08 | Robert H. Horton | High compression shaft configuration and related method for screw press systems used in rendering applications |
-
2016
- 2016-12-02 AT ATA51097/2016A patent/AT518983B1/en active
-
2017
- 2017-11-02 EP EP17199701.8A patent/EP3330068B1/en active Active
- 2017-11-24 MY MYPI2017704509A patent/MY190385A/en unknown
- 2017-11-27 US US15/822,622 patent/US10870250B2/en active Active
- 2017-11-30 CA CA2987123A patent/CA2987123C/en active Active
- 2017-12-01 EA EA201792416A patent/EA036223B1/en not_active IP Right Cessation
- 2017-12-01 CN CN201711245816.0A patent/CN108204715B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108204715B (en) | 2021-08-17 |
| US20180154599A1 (en) | 2018-06-07 |
| EP3330068C0 (en) | 2024-01-03 |
| BR102017024478A2 (en) | 2018-06-19 |
| AT518983B1 (en) | 2018-03-15 |
| EP3330068A1 (en) | 2018-06-06 |
| CN108204715A (en) | 2018-06-26 |
| US10870250B2 (en) | 2020-12-22 |
| MY190385A (en) | 2022-04-20 |
| AT518983A4 (en) | 2018-03-15 |
| EP3330068B1 (en) | 2024-01-03 |
| EA036223B1 (en) | 2020-10-15 |
| EA201792416A1 (en) | 2018-08-31 |
| CA2987123C (en) | 2023-08-08 |
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